This sounds to me like you might be buffering a linestring and not a polygon. Is that possible? Ie are the countries represented as outlines (linestrings) rather than polygons?
Roger André wrote: > Hi All, > > I'm having some problems with features that are being returned from an > ST_Buffer operation in PostGIS. When I try to buffer the extents of > Papua New Guinea, a large region in the middle of its extents is > omitted. You can see a visual representation of this at > http://lagerratrobe.blogspot.com/2009/03/problem-with-postgis-stbuffer.html > > If I just select the country itself, I get back all of the features > that I'm expecting. In the image I've posted above, the black area > indicates the results of that query. > > I am using postgresql-8.3.5, and postgis-1.3.3. My select statements > is as follows: > select name, Buffer(the_geom, .12) from coastlines where > iso_3_code = 'PNG'; > > I've tried this using both a free countries shapefile, as well as an > ESRI one, and get the same results. I'm a bit baffled, and unsure if > I have a problem with both data sets, or in my query, or...? If > someone else has had a similar problem in the past, and can shed some > light on it, I'd greatly appreciate it. > > Thanks in advance, > > Roger > -- > ------------------------------------------------------------------------ > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > -- Regards, Chris Hermansen mailto:[email protected] tel+1.604.714.2878 · fax+1.604.733.0631 · mob+1.778.232.0644 Timberline Natural Resource Group · http://www.timberline.ca 401 · 958 West 8th Avenue · Vancouver BC · Canada · V5Z 1E5 _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
